Developer reply by Josh Geenen
Rated 3 out of 5 stars
After updating to Thunderbird 45, this now only works if I go into my address book and manually tell it to sync. None of the menu options on the main screen work.
This review is for a previous version of the add-on (2.0.10).I believe I've identified the problem and have released updates to gContactSync (2.0.11) and Contact Photos (1.1.12). If you need it to work before the update is reviewed you can disable all other add-ons and restart Thunderbird.
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